Two new nickel(II) complexes, namely Ni(L¹)₂ (1) and Ni(L²)₂·CH₂Cl₂(2) were obtained by reacting nickel(II) acetate tetrahydrate with the benzothiadiazole Schiff base ligands HL¹ = 2-[4-(2,1,3-benzothiadiazole)imino]methyl-phenol or HL² = 2-[(2,1,3-benzothiadiazol-4-ylimino)methyl]-6-methoxyphenol in the presence of Et₃N. The tridentate NNO chelate ligands induce a distorted octahedral environment around the nickel(II) ions. Single crystal X-ray diffraction analysis reveals elongated Ni–N bonds with the nitrogen atom of the benzothiadiazole ring in both complexes. Intermolecular hydrogen bonds and π–π stacking interactions create two-dimensional and three-dimensional supramolecular arrays, respectively, for complexes 1 and 2. Magnetic susceptibility and high-field electron paramagnetic resonance measurements show the presence of significant magnetic anisotropy, with an axial distortion parameter D of −8–−10 cm⁻¹.

中文翻译：

---

苯并噻二唑席夫碱配体的六配位镍 (II) 配合物：合成、晶体结构、磁性和 HFEPR 研究

四水乙酸镍( II )与苯并噻二唑希夫碱配体HL反应得到两种新的镍( II )配合物Ni(L ¹ ) ₂ ( 1 )和Ni(L ² ) ₂ ·CH ₂ Cl ₂ ( 2 ) ¹ = 2-[4-(2,1,3-苯并噻二唑)亚氨基]甲基苯酚或 HL ² = 2-[(2,1,3-苯并噻二唑-4-基亚氨基)甲基]-6-甲氧基苯酚Et ₃ N。三齿NNO螯合配体在镍( II )离子周围诱导出扭曲的八面体环境。单晶 X 射线衍射分析表明，两种配合物中苯并噻二唑环的氮原子均具有延长的 Ni-N 键。配合物1和2 的分子间氢键和 π-π 堆积相互作用分别形成二维和三维超分子阵列。磁化率和高场电子顺磁共振测量表明存在显着的磁各向异性，轴向畸变参数D为-8–-10 cm ^-1。